发明名称 |
SEAMLESS STEEL TUBE FOR DRIVE SHAFT AND METHOD OF MANUFACTURING THE SAME |
摘要 |
A steel tube hot-finished by the Mannesmann tube-making method is subjected to a simple grinding process for the inner surface, and thereafter to a cold drawing, so that the depth d of the concave portion in the concavo-convex profile forming the inner surface of the steel tube, the surface roughness Ra and the width w of the entrance in the concave portion are specified, or similarly the depth d of the concave portion in the concavo-convex profile, the Vickers hardness Hv of the inner surface layer and the width w of the entrance in the concave portion are specified, hollow parts for a drive shaft, which have an excellent fatigue strength and which is optimal to reduce the weight of a car body, can be produced. Accordingly, the application of the manufacturing method according to the present invention allows drive shafts for automobiles to be efficiently produced in a reduced manufacturing cost, thereby providing a significant advantage in the industry. <IMAGE> |
申请公布号 |
EP1595609(A4) |
申请公布日期 |
2006.03.22 |
申请号 |
EP20040705922 |
申请日期 |
2004.01.28 |
申请人 |
SUMITOMO METAL INDUSTRIES, LTD. |
发明人 |
KURODA, KOUICHI,;OKUI, TATSUYA,;HITOSHIO, KEISUKE, |
分类号 |
B21B17/02;B21B17/14;B21B19/04;B21B23/00;B21B27/02 |
主分类号 |
B21B17/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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